CORONA, CA - Pro Circuit has a reputation as one of the premier engine builders in the sport and we constantly strive to offer our customers only the finest performance parts available. Our newest product is a high-compression piston for the 2016 KX450F that offers superior low-end torque over OEM as well as gains in high RPM performance. We designed this new piston for strong performance in a stock engine or a modified engine configuration.

As proof that we never stop looking for more power, we've updated our 2015-16 KX250F high-compression piston kit to offer the utmost in additional performance in both models.

Pro Circuit. We Race.